Soldering tool



1934- w. J. FROHMUTH ET AL SOLDERING TOOL Filed Feb. 3, 1933 IN VEN TORS.

% ATTORNEY tion:and

- oi the sleeve, which is part tool Patented Dec. 25, 1934 UNITED STATES PATENT OFFICE 1,985,492 I sonnnamo TOOL William J. Frohmuth and Donald E. Collagen, Fort Wayne, Ind.

Application February 3, 1933, Serial No. 854,992

2 Claim.

This invention relates to improvements in soldering tools, and one of the objects thereof is to provide a tool or its class with a durable and renewable. tip. Another object is to aii'ord in an electrically heated soldering tool conveniently replaceable parts particularly the heating unit and the soldering tip. And, a further object of the invention is to construct the tip for the tool in such manner that it will endure constant usage for long protracted periods as is required I in manufacturing operations.

In ordinary practice the tips of soldering tools commonly made of copper soon become impaired and inefllcient because of the deteriorative efinduced. by gas arising from the tip.

An illustrative embodiment of the invention shown in the aocomllnying drawing forming part hereof in which:'

Fig. 1 is an elevation showing the head portion of a soldering tool or the electrically heated type with the invention embodied therein. portions being cut away to disclose the interior construcend view or the tool. The illustrative t ol-the invention consists of a. sleeve 1 constituting a heating chamber; a heating unit l removably disposed Pig. 2 is a front The sleeve 1 is preierably'tubular in form and made of any. suitable metal having emcient heat loy or nickel'and wlreareoonnectedwithcorresponding leads8and lthatex'tendiromthecoreoutthroughthe handleto a source or electrical energy (not shown). 'l'hecoreisshapedandp oportionedso astoapproalinatelyntinthesleeveinthespace use in applying solder I between the inserted end's oi the tip and shank.

The tip 3 is formed with an inner axial body 10 of solid copper and a circumferential tubular covering 11 01' non-corrosive metal, preferably an alloy of nickel and copper in which the nickel 5 predominates in a ratio with the copper of approximately two to one. The covering and the inner body are fitted tightly together by forcing the copper body under high pressure into the bore of the covering, the wall of which is of sufllcient thickness as to withstand the consequent radial outward pressure of the body. One end of the covering is externally threaded to fit the internally threaded sleeve, and the opposite end of the covering and the body is tapered so that the copper body protrudesbeyond the cor-- responding end of the covering to a point 12.

In use, the tapered end 01' the tip 3 is tinned as in the established practice preliminary to its which is carried out as in the ordinary manner with the aid of a suitable flux. The sleeve 1 and the tip secured therein is heated and sustained at the desired temperature as may be required by the current'supplied through the heating unit. The flux or vaporous gas arising therefrom upon becoming hot is kept from contacting with the copper inner body 01' the tip back oi its pointed end by the coating 11 which circumvents corrosion and deterioration of the copper body so that the lite thereof is indefinitely protracted even though the tool is sublooted tonumerous changes of temperature and severe usage.

We claim:

1. A soldering tip having an inner axial body or solid copper and a covering oi non-corrosive metal encompassing the circumferential wall oi said body, one end of said tip being shaped so that the copper body protrudes beyond the corresponding end of said covering to form a soldering point. and the opposite end of said tip being externally threaded for detachable connection with a soldering tool.

2. A soldering tip having an inner axial body of solid copper and a covering of non-corrosive metal encompassing the circumferential wallet said body, one end or said tip being shaped so that the copper body protrudes beyond thecorresponding end of said covering to form a solderiiig point, and means for detachably securing said tip in a soldering tool. 

